1 Isotonic -a muscle fiber contraction in which force production is unchanged when the muscle contracts causing movement of an external load.  Isokinetic -a muscle fiber contraction in which force production of the contraction is sufficient to overcome the external load.
HIV/AIDS. HIV Risk Behaviors. The risk of getting HIV varies widely depending on the type of exposure or behavior (such as sharing needles or having sex without a condom). Some exposures to HIV carry a much higher risk of transmission than other exposures.
If you have another sexually transmitted disease, you chances of contracting HIV during sex are much higher. Direct blood or mucous membrane contact with an infected personâs blood. From an infected mother to her child, during pregnancy, birth, or breast feeding. Sharing needles or equipment for drug use.